1.1 本试验方法包括使用空气喷射筛装置测定粉末活性炭的粒度。就本试验方法而言，粉末状活性炭被定义为颗粒尺寸主要在80目（0.180 mm）通过500目（0.025mm）。 1.2 以国际单位制表示的数值应视为标准。括号中给出的英寸磅单位仅供参考。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 细网和粉末活性炭的粒度有时用于评估滤饼过滤率和过滤应用中的过滤器渗透性。 5.2 细网或粉状活性炭的选择和处理，以及使用细网或粉末状活性炭的工艺操作，都需要了解颗粒尺寸。 5.3 本试验方法仅适用于单筛试验。为了测定样品的粒度分布，必须使用具有不同开口的筛网重复进行试验。 注1: 相对湿度（RH）会影响该测试的重复性和准确性。与环境空气的相对湿度不平衡的活性炭可能会相应地失重或增重，这取决于活性炭是否吸收或失去水分。

1.1 This test method covers the determination of the particle size of powdered activated carbons using an air-jet sieve device. For purposes of this test method, powdered activated carbon is defined as activated carbon in particle sizes predominantly in a range of 80 mesh (0.180 mm) through 500 mesh (0.025 mm). 1.2 The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 The particle size of fine mesh and powdered activated carbon is sometimes used to evaluate filter cake filtration rates and the filter penetration in filtering applications. 5.2 The selection and handling of fine mesh or powdered activated carbon, and operation of processes using fine mesh or powdered activated carbon, requires the knowledge of the particle size. 5.3 This test method is intended for single sieve testing only. For determination of particle size distribution of a sample, the test must be repeated using sieves with different openings. Note 1: Relative humidity (RH) can affect the repeatability and accuracy of this test. Activated carbon not at equilibrium with the RH of the ambient air may lose or gain weight accordingly, dependent upon whether the carbon picks up or loses moisture.